WD-40 can do a lot of great things, from clean stainless steel to clean inkjet printer cartridges, but if you're dealing with a particularly dirty or stained toilet and nothing else seems to be working, a little WD-40 in the water may be all you need to break down those caked-on stains.

The key here is that only a little will do you—there's no need to go spraying down the inside of your toilet with WD-40 just to get rid of the lime stains and discolorations from the last person that lived in the apartment you're now renting. Give it a squirt or two, a few minutes to break up, and then attack it with a toilet brush. Follow up later with bleach, vinegar, or whatever cleaner you prefer.

I can vouch for this one working as described, but just use it as a last resort. WD-40 can work magic in a lot of areas, but it's still a commercial chemical with a specific purpose (and hundreds more off-label uses) and should be handled with care. Do you have any other ingenious WD-40 off-label uses? Share them in the comments below.